Yes, I mean the hostname. I have a letsencrypt cert for jabber.mydomain.tld, and it works after the manual import using keytool. My only problem is the plugin not automatically updating (or probably even recognizing) the certs as soon as they are placed inside the hotdeploy directory. I also made sure, that the permissions on the certs are set properly for openfire.
It’s not a big dealbreaker for me, rather a small inconvenience that the server has to be restartet through a cronjob once in a while.